ok so I am having the same problem on a Mac. I looked at the manifest xml file and my backup app version is 7.2.35700. Is there an older version I should be downloading to open this with? (it does not open now). this is as far as I get with 7.2.35700. 
problem solved, I deleted all the previous files (like mentioned above) and added my restore and e-mails appeared. thanks
I tried deleting all files in the Roaming>… as described above, and my eM disappeared entirely.
The way that worked for me was to make a “normal” backup in the new version (on 2nd computer), then delete it (stored in Docs>eM Client) and replace it with the Backup.zip file from the 1st computer! (Surprisingly, it does read the .zip file).
The support in this forum for the most part is useless with “best guesses” and self-absorbed like-minded “experts” as if they are on Parler and practice sophism.
I have the same issue as you. Tutorials simply say copy the files over.
My 30 day trial is up. I’m going back to Mozilla Thunderbird. Bye.
Sorry for your experience @Hmm888. This is a user supported forum, and for the most part offers support from fellow users. For technical assistance from the company you will need to purchase a Pro License.
Maybe I can help with restoring your backup though.
Where is the backup zip file created by eM Client located on your computer?
If it is not automatically listed when you begin the restore, you can browse for it by clicking on the browse icon.
Can you give that a go and see if it works.
Having the same issue. I can see both the zipped files and an unzipped folder of one but eM Client only sees the unzipped one and says that the selected folder does not contain any backup files.
The backup.zip files in your screenshot on the right window should definitely be able to be restored.
Try first coping those three .zip backup files to your local c:\user\steve\documents\eM Client profile folder. Then in eM Client go to “Menu / Settings / General / Backup” and set the backup location to the same eM Client profile folder and save eM Client settings.
Then close and reopen eM Client and click “Menu / File / Restore” and it should then being up those 3 backup.zip files & be able to restore.
In the end I had to get service agent to do it. Don’t know why it didn’t work on our (mine or their) earlier attempts but way more complex than it should have been.
Steve